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Thread: How do I reduce amps??

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    Default How do I reduce amps??

    Need some help from electronic friends, I know how to reduce voltage with resistors, what do I use to reduce amps? I want to branch off my 12v 5 amp source with a 12 v 300 mA for battery charging. I google it and the results are always that the source amps doesn't matter as the item draws what it needs except for battery charging. They mention a current limiter but I don't know what this is.

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    Resistorssss

    DailyVapes
    1.DIY SDCookies2DIY Carapplecinna3DIY toffee4DIY GBCMods:1Provari2.VariMini3.BP4.Str8's modsPIF

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    Quote Originally Posted by Str8V8ping View Post
    Resistorssss
    I don't want to reduce voltage..

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    I can't connect Ohms law to my mod. I want to reduce my source from 12v 5amp to 12v 300 mA to charge my batteries, if I put 5amps to my Li-Po they will explode. My battery is a 11.1v Li-Po.

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    If you where trying to apply juice directly to your batt, they would be destroyed from the fact that you
    where putting 12V through a presumed 3.7V batt. The charger will regulate amps regardless of the source,
    but you need to step down the voltage to 5v's if it is an USB charger. An AC adapter would presumably
    step down voltage and regulate amps, but it sounds like you're using a 12V batt? Or, maybe a PC
    power supply?

    Think about it, the 5V 2amp wall adapter that most of us use for PT's and charging instead of
    risking our PC's does not apply 2 amps to batt. The charger that you plug into it regulates that.

    Duh!! I just seen where you said batt was 11.1V's, is 12V's what is required to charge that batt?
    I would still think that a charger will regulate the amps, and on a side note, it seems to me
    300ma's would take FOREVER to charge a batt that big.
    Last edited by VpnDrgn; 12-13-2011 at 01:42 PM.

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    No one is answering my question. How do I reduce 12v 5amp source to 12v 300 mA. Forget why I want to do it. And yes all I use for vaping is stepped down 11.1 v Li-Po batteries so all this abought 5v and 3.7v is irrelevant.
    I thank you all for your suggestions but still haven't found the answer.

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    http://www.hobbyking.com/hobbycity/s...y_Battery.html
    This is one of the batteries I use
    Last edited by BJ43; 12-13-2011 at 02:15 PM.

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    Maybe this will help..

    I understand that you want to limit the current possibly to slow charge a battery.
    I found this it says you can adjust the current by changing R2.

    An Add-On Current Limiter For Your Power Supply
    Ahh more studying..
    BJ43 likes this.

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